Dual shot glass.
Side 1 - 40ml
side 2 - 20ml
Use transparent filament for best results. You can print with many infill types for added style points. Also, use thick walls to avoid leakage of fluids.
Safe 3D printing materials for food contact (FDA approved):
PLA without additives
PET, PETG / T-Glass
Natural grade Nylon 6 & 6.6 (without additives)